Embed form page in widget?

It's possible but it isn't something Gravity Forms does itself. Users have implemented it within a lightbox before. But it's a customization. How you use the shortcode or the function call to display the form is up to you... the site design, theme, etc. is all in your hands.

What do you mean the Post Image doesn't post for you?

If you mean the Post Image doesn't show up in your Post Content, it doesn't do this automatically.

The Post Image field only uploads the image to your media library and assigns it to the Gallery for that post. You can see if this happens by editing the post that is created and going to the Media Library to see if the image exists.

If you want it to appear in your post, you have to use the Content Template functionality of the Post Body field to insert the Post Image field variable into the content template. Please note, if you use the content template you also have to insert the Post Body field variable otherwise it won't be included. If you use the content template feature, whatever is in the content template is what will be used to create the post content.

We don't automatically insert Post Images into the Post Body because WordPress doesn't do this either. When you upload an image in WordPress when creating a post you have to insert the image into the post. We couldn't do it automatically because we wouldn't know where it should go, what size image, etc.